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 #!/bin/sh
 #------------------------------------------------------------------------------
 #
 # File: SIG-antiDDoS.sh
 #
 # Compiler: Ruslan Abuzant <ruslan@abuzant.com>
 #           PS> Collected From Lots Of Sources
 #           PS> Credits: Real Authors (no idea)
 #
 # URL: http://www.liteforex.org/
 #
 # License: GNU GPL (version 2, or any later version).
 #
 # Configuration.
 #------------------------------------------------------------------------------
 
 # For debugging use iptables -v.
 IPTABLES="/sbin/iptables"
 IP6TABLES="/sbin/ip6tables"
 MODPROBE="/sbin/modprobe"
 RMMOD="/sbin/rmmod"
 ARP="/usr/sbin/arp"
 
 
 # Logging options.
 #------------------------------------------------------------------------------
 LOG="LOG --log-level debug --log-tcp-sequence --log-tcp-options"
 LOG="$LOG --log-ip-options"
 
 
 # Defaults for rate limiting
 #------------------------------------------------------------------------------
 RLIMIT="-m limit --limit 3/s --limit-burst 8"
 
 
 # Unprivileged ports.
 #------------------------------------------------------------------------------
 PHIGH="1024:65535"
 PSSH="1000:1023"
 
 
 # Load required kernel modules
 #------------------------------------------------------------------------------
 $MODPROBE ip_conntrack_ftp
 $MODPROBE ip_conntrack_irc
 
 
 # Mitigate ARP spoofing/poisoning and similar attacks.
 #------------------------------------------------------------------------------
 # Hardcode static ARP cache entries here
 # $ARP -s IP-ADDRESS MAC-ADDRESS
 
 
 # Kernel configuration.
 #------------------------------------------------------------------------------
 
 # Disable IP forwarding.
 # On => Off = (reset)
 echo 1 > /proc/sys/net/ipv4/ip_forward
 echo 0 > /proc/sys/net/ipv4/ip_forward
 
 # Enable IP spoofing protection
 for i in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 1 > $i; done
 
 # Protect against SYN flood attacks
 echo 1 > /proc/sys/net/ipv4/tcp_syncookies
 
 # Ignore all incoming ICMP echo requests
 echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all
 
 # Ignore ICMP echo requests to broadcast
 echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
 
 # Log packets with impossible addresses.
 for i in /proc/sys/net/ipv4/conf/*/log_martians; do echo 1 > $i; done
 
 # Don't log invalid responses to broadcast
 echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
 
 # Don't accept or send ICMP redirects.
 for i in /proc/sys/net/ipv4/conf/*/accept_redirects; do echo 0 > $i; done
 for i in /proc/sys/net/ipv4/conf/*/send_redirects; do echo 0 > $i; done
 
 # Don't accept source routed packets.
 for i in /proc/sys/net/ipv4/conf/*/accept_source_route; do echo 0 > $i; done
 
 # Disable multicast routing
 for i in /proc/sys/net/ipv4/conf/*/mc_forwarding; do echo 0 > $i; done
 
 # Disable proxy_arp.
 for i in /proc/sys/net/ipv4/conf/*/proxy_arp; do echo 0 > $i; done
 
 # Enable secure redirects, i.e. only accept ICMP redirects for gateways
 # Helps against MITM attacks.
 for i in /proc/sys/net/ipv4/conf/*/secure_redirects; do echo 1 > $i; done
 
 # Disable bootp_relay
 for i in /proc/sys/net/ipv4/conf/*/bootp_relay; do echo 0 > $i; done
 
 # Default policies.
 #------------------------------------------------------------------------------
 
 # Drop everything by default.
 $IPTABLES -P INPUT DROP
 $IPTABLES -P FORWARD DROP
 $IPTABLES -P OUTPUT DROP
 
 # Set the nat/mangle/raw tables' chains to ACCEPT
 $IPTABLES -t nat -P PREROUTING ACCEPT
 $IPTABLES -t nat -P OUTPUT ACCEPT
 $IPTABLES -t nat -P POSTROUTING ACCEPT
 
 $IPTABLES -t mangle -P PREROUTING ACCEPT
 $IPTABLES -t mangle -P INPUT ACCEPT
 $IPTABLES -t mangle -P FORWARD ACCEPT
 $IPTABLES -t mangle -P OUTPUT ACCEPT
 $IPTABLES -t mangle -P POSTROUTING ACCEPT
 
 # Cleanup.
 #------------------------------------------------------------------------------
 
 # Delete all
 $IPTABLES -F
 $IPTABLES -t nat -F
 $IPTABLES -t mangle -F
 
 # Delete all
 $IPTABLES -X
 $IPTABLES -t nat -X
 $IPTABLES -t mangle -X
 
 # Zero all packets and counters.
 $IPTABLES -Z
 $IPTABLES -t nat -Z
 $IPTABLES -t mangle -Z
 
 # Completely disable IPv6.
 #------------------------------------------------------------------------------
 
 # Block all IPv6 traffic
 # If the ip6tables command is available, try to block all IPv6 traffic.
 if test -x $IP6TABLES; then
 # Set the default policies
 # drop everything
 $IP6TABLES -P INPUT DROP 2>/dev/null
 $IP6TABLES -P FORWARD DROP 2>/dev/null
 $IP6TABLES -P OUTPUT DROP 2>/dev/null
 
 # The mangle table can pass everything
 $IP6TABLES -t mangle -P PREROUTING ACCEPT 2>/dev/null
 $IP6TABLES -t mangle -P INPUT ACCEPT 2>/dev/null
 $IP6TABLES -t mangle -P FORWARD ACCEPT 2>/dev/null
 $IP6TABLES -t mangle -P OUTPUT ACCEPT 2>/dev/null
 $IP6TABLES -t mangle -P POSTROUTING ACCEPT 2>/dev/null
 
 # Delete all rules.
 $IP6TABLES -F 2>/dev/null
 $IP6TABLES -t mangle -F 2>/dev/null
 
 # Delete all chains.
 $IP6TABLES -X 2>/dev/null
 $IP6TABLES -t mangle -X 2>/dev/null
 
 # Zero all packets and counters.
 $IP6TABLES -Z 2>/dev/null
 $IP6TABLES -t mangle -Z 2>/dev/null
 fi
 
 # Custom user-defined chains.
 #------------------------------------------------------------------------------
 
 # LOG packets, then ACCEPT.
 $IPTABLES -N ACCEPTLOG
 $IPTABLES -A ACCEPTLOG -j $LOG $RLIMIT --log-prefix "ACCEPT "
 $IPTABLES -A ACCEPTLOG -j ACCEPT
 
 # LOG packets, then DROP.
 $IPTABLES -N DROPLOG
 $IPTABLES -A DROPLOG -j $LOG $RLIMIT --log-prefix "DROP "
 $IPTABLES -A DROPLOG -j DROP
 
 # LOG packets, then REJECT.
 # TCP packets are rejected with a TCP reset.
 $IPTABLES -N REJECTLOG
 $IPTABLES -A REJECTLOG -j $LOG $RLIMIT --log-prefix "REJECT "
 $IPTABLES -A REJECTLOG -p tcp -j REJECT --reject-with tcp-reset
 $IPTABLES -A REJECTLOG -j REJECT
 
 # Only allows RELATED ICMP types
 # (destination-unreachable, time-exceeded, and parameter-problem).
 # TODO: Rate-limit this traffic?
 # TODO: Allow fragmentation-needed?
 # TODO: Test.
 $IPTABLES -N RELATED_ICMP
 $IPTABLES -A RELATED_ICMP -p icmp --icmp-type destination-unreachable -j ACCEPT
 $IPTABLES -A RELATED_ICMP -p icmp --icmp-type time-exceeded -j ACCEPT
 $IPTABLES -A RELATED_ICMP -p icmp --icmp-type parameter-problem -j ACCEPT
 $IPTABLES -A RELATED_ICMP -j DROPLOG
 
 # Make It Even Harder To Multi-PING
 $IPTABLES  -A INPUT -p icmp -m limit --limit 1/s --limit-burst 2 -j ACCEPT
 $IPTABLES  -A INPUT -p icmp -m limit --limit 1/s --limit-burst 2 -j LOG --log-prefix PING-DROP:
 $IPTABLES  -A INPUT -p icmp -j DROP
 $IPTABLES  -A OUTPUT -p icmp -j ACCEPT
 
 # Only allow the minimally required/recommended parts of ICMP. Block the rest.
 #------------------------------------------------------------------------------
 
 # TODO: This section needs a lot of testing!
 
 # First, drop all fragmented ICMP packets (almost always malicious).
 $IPTABLES -A INPUT -p icmp --fragment -j DROPLOG
 $IPTABLES -A OUTPUT -p icmp --fragment -j DROPLOG
 $IPTABLES -A FORWARD -p icmp --fragment -j DROPLOG
 
 # Allow all ESTABLISHED ICMP traffic.
 $IPTABLES -A INPUT -p icmp -m state --state ESTABLISHED -j ACCEPT $RLIMIT
 $IPTABLES -A OUTPUT -p icmp -m state --state ESTABLISHED -j ACCEPT $RLIMIT
 
 # Allow some parts of the RELATED ICMP traffic, block the rest.
 $IPTABLES -A INPUT -p icmp -m state --state RELATED -j RELATED_ICMP $RLIMIT
 $IPTABLES -A OUTPUT -p icmp -m state --state RELATED -j RELATED_ICMP $RLIMIT
 
 # Allow incoming ICMP echo requests (ping), but only rate-limited.
 $IPTABLES -A INPUT -p icmp --icmp-type echo-request -j ACCEPT $RLIMIT
 
 # Allow outgoing ICMP echo requests (ping), but only rate-limited.
 $IPTABLES -A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT $RLIMIT
 
 # Drop any other ICMP traffic.
 $IPTABLES -A INPUT -p icmp -j DROPLOG
 $IPTABLES -A OUTPUT -p icmp -j DROPLOG
 $IPTABLES -A FORWARD -p icmp -j DROPLOG
 
 # Selectively allow certain special types of traffic.
 #------------------------------------------------------------------------------
 
 # Allow loopback interface to do anything.
 $IPTABLES -A INPUT -i lo -j ACCEPT
 $IPTABLES -A OUTPUT -o lo -j ACCEPT
 
 # Allow incoming connections related to existing allowed connections.
 $IPTABLES -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
 
 # Allow outgoing connections EXCEPT invalid
 $IPTABLES -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
 
 # Miscellaneous.
 #------------------------------------------------------------------------------
 
 # We don't care about Milkosoft, Drop SMB/CIFS/etc..
 $IPTABLES -A INPUT -p tcp -m multiport --dports 135,137,138,139,445,1433,1434 -j DROP
 $IPTABLES -A INPUT -p udp -m multiport --dports 135,137,138,139,445,1433,1434 -j DROP
 
 # Explicitly drop invalid incoming traffic
 $IPTABLES -A INPUT -m state --state INVALID -j DROP
 
 # Drop invalid outgoing traffic, too.
 $IPTABLES -A OUTPUT -m state --state INVALID -j DROP
 
 # If we would use NAT, INVALID packets would pass - BLOCK them anyways
 $IPTABLES -A FORWARD -m state --state INVALID -j DROP
 
 # PORT Scanners (stealth also)
 $IPTABLES -A INPUT -m state --state NEW -p tcp --tcp-flags ALL ALL -j DROP
 $IPTABLES -A INPUT -m state --state NEW -p tcp --tcp-flags ALL NONE -j DROP
 
 # TODO: Some more anti-spoofing rules? For example:
 # $IPTABLES -A INPUT -p tcp --tcp-flags ALL FIN,URG,PSH -j DROP
 # $IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
 # $IPTABLES -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP
 $IPTABLES -N SYN_FLOOD
 $IPTABLES -A INPUT -p tcp --syn -j SYN_FLOOD
 $IPTABLES -A SYN_FLOOD -m limit --limit 2/s --limit-burst 6 -j RETURN
 $IPTABLES -A SYN_FLOOD -j DROP
 
 # TODO: Block known-bad IPs (see http://www.dshield.org/top10.php).
 # $IPTABLES -A INPUT -s INSERT-BAD-IP-HERE -j DROPLOG
 
 # Drop any traffic from IANA-reserved IPs.
 #------------------------------------------------------------------------------
 
 $IPTABLES -A INPUT -s 0.0.0.0/7 -j DROP
 $IPTABLES -A INPUT -s 2.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 5.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 7.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 10.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 23.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 27.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 31.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 36.0.0.0/7 -j DROP
 $IPTABLES -A INPUT -s 39.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 42.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 49.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 50.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 77.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 78.0.0.0/7 -j DROP
 $IPTABLES -A INPUT -s 92.0.0.0/6 -j DROP
 $IPTABLES -A INPUT -s 96.0.0.0/4 -j DROP
 $IPTABLES -A INPUT -s 112.0.0.0/5 -j DROP
 $IPTABLES -A INPUT -s 120.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 169.254.0.0/16 -j DROP
 $IPTABLES -A INPUT -s 172.16.0.0/12 -j DROP
 $IPTABLES -A INPUT -s 173.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 174.0.0.0/7 -j DROP
 $IPTABLES -A INPUT -s 176.0.0.0/5 -j DROP
 $IPTABLES -A INPUT -s 184.0.0.0/6 -j DROP
 $IPTABLES -A INPUT -s 192.0.2.0/24 -j DROP
 $IPTABLES -A INPUT -s 197.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 198.18.0.0/15 -j DROP
 $IPTABLES -A INPUT -s 223.0.0.0/8 -j DROP
 $IPTABLES -A INPUT -s 224.0.0.0/3 -j DROP
 
 # Selectively allow certain outbound connections, block the rest.
 #------------------------------------------------------------------------------
 
 # Allow outgoing DNS requests. Few things will work without this.
 $IPTABLES -A OUTPUT -m state --state NEW -p udp --dport 53 -j ACCEPT
 $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 53 -j ACCEPT
 
 # Allow outgoing HTTP requests. Unencrypted, use with care.
 $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 80 -j ACCEPT
 
 # Allow outgoing HTTPS requests.
 $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 443 -j ACCEPT
 
 # Allow outgoing SMTPS requests. Do NOT allow unencrypted SMTP!
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 465 -j ACCEPT
 
 # Allow outgoing "submission" (RFC 2476) requests.
 $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 587 -j ACCEPT
 
 # Allow outgoing POP3S requests.
 $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 995 -j ACCEPT
 
 # Allow outgoing SSH requests.
 $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 22 -j ACCEPT
 
 # Allow outgoing FTP requests. Unencrypted, use with care.
 $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 21 -j ACCEPT
 
 # Allow outgoing NNTP requests. Unencrypted, use with care.
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 119 -j ACCEPT
 
 # Allow outgoing NTP requests. Unencrypted, use with care.
 # $IPTABLES -A OUTPUT -m state --state NEW -p udp --dport 123 -j ACCEPT
 
 # Allow outgoing IRC requests. Unencrypted, use with care.
 # Note: This usually needs the ip_conntrack_irc kernel module.
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 6667 -j ACCEPT
 
 # Allow outgoing requests to various proxies. Unencrypted, use with care.
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 8080 -j ACCEPT
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 8090 -j ACCEPT
 
 # Allow outgoing DHCP requests. Unencrypted, use with care.
 # TODO: This is completely untested, I have no idea whether it works!
 # TODO: I think this can be tightened a bit more.
 $IPTABLES -A OUTPUT -m state --state NEW -p udp --sport 67:68 --dport 67:68 -j ACCEPT
 
 # Allow outgoing CVS requests. Unencrypted, use with care.
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 2401 -j ACCEPT
 
 # Allow outgoing MySQL requests. Unencrypted, use with care.
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 3306 -j ACCEPT
 
 # Allow outgoing SVN requests. Unencrypted, use with care.
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 3690 -j ACCEPT
 
 # Allow outgoing PLESK requests. Unencrypted, use with care.
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 8443 -j ACCEPT
 
 # Allow outgoing Tor (http://tor.eff.org) requests.
 # Note: Do _not_ use unencrypted protocols over Tor (sniffing is possible)!
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9001 -j ACCEPT
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9002 -j ACCEPT
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9030 -j ACCEPT
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9031 -j ACCEPT
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9090 -j ACCEPT
 # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9091 -j ACCEPT
 
 # Allow outgoing OpenVPN requests.
 $IPTABLES -A OUTPUT -m state --state NEW -p udp --dport 1194 -j ACCEPT
 
 # TODO: ICQ, MSN, GTalk, Skype, Yahoo, etc...
 
 # Selectively allow certain inbound connections, block the rest.
 #------------------------------------------------------------------------------
 
 # Allow incoming DNS requests.
 $IPTABLES -A INPUT -m state --state NEW -p udp --dport 53 -j ACCEPT
 $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 53 -j ACCEPT
 
 # Allow incoming HTTP requests.
 $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 80 -j ACCEPT
 
 # Allow incoming HTTPS requests.
 $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 443 -j ACCEPT
 
 # Allow incoming POP3 requests.
 $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 110 -j ACCEPT
 
 # Allow incoming IMAP4 requests.
 $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 143 -j ACCEPT
 
 # Allow incoming POP3S requests.
 $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 995 -j ACCEPT
 
 # Allow incoming SMTP requests.
 $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 25 -j ACCEPT
 
 # Allow incoming SSH requests.
 $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 22 -j ACCEPT
 
 # Allow incoming FTP requests.
 $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 21 -j ACCEPT
 
 # Allow incoming NNTP requests.
 # $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 119 -j ACCEPT
 
 # Allow incoming MySQL requests.
 # $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 3306 -j ACCEPT
 
 # Allow incoming PLESK requests.
 # $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 8843 -j ACCEPT
 
 # Allow incoming BitTorrent requests.
 # TODO: Are these already handled by ACCEPTing established/related traffic?
 # $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 6881 -j ACCEPT
 # $IPTABLES -A INPUT -m state --state NEW -p udp --dport 6881 -j ACCEPT
 
 # Allow incoming nc requests.
 # $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 2030 -j ACCEPT
 # $IPTABLES -A INPUT -m state --state NEW -p udp --dport 2030 -j ACCEPT
 
 # Explicitly log and reject everything else.
 #------------------------------------------------------------------------------
 # Use REJECT instead of REJECTLOG if you don't need/want logging.
 $IPTABLES -A INPUT -j REJECTLOG
 $IPTABLES -A OUTPUT -j REJECTLOG
 $IPTABLES -A FORWARD -j REJECTLOG
 
 
 #------------------------------------------------------------------------------
 # Testing the firewall.
 #------------------------------------------------------------------------------
 
 # You should check/test that the firewall really works, using
 # iptables -vnL, nmap, ping, telnet, ...
 
 # Exit gracefully.
 #------------------------------------------------------------------------------
 ## write to boot if needed?
 ### iptables-save > /etc/sysconfig/iptables ??
     exit 0